I would kill myself (GOD) and tells all the human that after I'm dead, they all have to start believing in themselves and stop depending on me Sooner or later they will realize that there is no more GOD exist on this earth, and only human can help themselves

I am God, God of Destruction...So I guess I'd do exactly what I do now....*twidles thumbs*...Ok this isn't working.

So i may not actually inherit my powers till I die, but when i do get them I'll do one of many things:
1) Destroy all the scum; Pedo's rapists, murderers...Don't want to know you, so they'll no longer exist.
2) Eliminate all naturally obtained diseases/viruses; Anything which you get randomly for no reason, like certain cancers. Though I believe in reap what you sow, so people who get lung cancer from smoking or any STI's in the room..been nice knowing you (Not that you can die from STI's)
3) Destroy the Driving Standards association;....Mainly because they're money grabbing bastards who won't pass anyone whose not 100% perfect at driving.
4) Enforce better laws; Our country sucks so bad I could set better laws and I'm only 18...Like I said, bringing back the death penalty for some, and harsher sentences for others. I'm looking at 25 years for drink drivers, they're not likely to do it again.
5) Solve world hunger and thirst;...Not going to say HOW I'll do it, but I will be god so I just can OK?
6) Reveal myself as the one and only god to stop all these bullshit religions from tearing each other to pieces. If they all believed in just me, then life would be easier.

I would kill half the population to show I ment business and then rule as the god of Doom and Chaos. I then would Kill my self in the form of a god of justice and mercy to win over the masses. Next for the good of all I would rule as a tyrant so something similar dosen't happen or at least that is what I will tell the masses. Then I will have people make manga and anime for me forever.

"The secret of life is honesty and fair dealing. If you can fake that, you've got it made."
-Groucho Marx